* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

#box {

    width: 1000px;
    height: 500px;
    overflow: hidden;
    position: relative;
}

#slider {
    width: 1000px;
    height: 500px;
    position: absolute;
    display: flex;
}

a {
    width: 1000px;
    height: 500px;
}

img {
    width: 1000px;
    height: 500px;
    margin: 0;
}

#box:hover #selector {
    display: flex;
}

#selector {
    width: 80px;
    height: 20px;
    position: absolute;
    bottom: 0;
    left: 500px;
    display: none;
    justify-content: space-between;
    z-index: 100;
}

#selector>span {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: lightsalmon;
    opacity: 0.8;
    margin-right: 5px;
    cursor: pointer;
}

#selector>span:hover {
    background-color: #8A8A8A;
}
#left,#right{
    width: 30px;
    height: 30px;
    position: absolute;
    top: 250px;
    background-color: lightsteelblue;
    font-size: 25px;
    border-radius: 50%;
    text-align: center;
    line-height: 100%;
    cursor: pointer;
    color: lightslategray;
}
#left{
    left: 0;
}
#right{
    right: 0;
}
#left:hover,#right:hover{
    background-color: #8A8A8A;
    color: #FFFFFF;
}